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Stock Compensation Plans (Details) (USD $) In Millions, unless otherwise specified	3 Months Ended		9 Months Ended
	Sep. 30, 2013	Sep. 30, 2012	Sep. 30, 2013	Sep. 30, 2012
Stock based Compensation Plans
Stock-based compensation plans expense	$ 3	$ 7	$ 8	$ 24
Income tax benefit	(1)	(2)	(3)	(8)
Total stock-based compensation plans expense	$ 2	$ 5	$ 5	$ 16

Represents the expense recognized during the period arising from equity-based compensation arrangements (for example, shares of stock, unit, stock options or other equity instruments) with employees, directors and certain consultants qualifying for treatment as employees.

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